Phoebus Lunetta 2.2 Watt LED Non-Rechargeable Tactical Flashlight uses two standard CR-123 batteries, which are included. This Flashlight by Phoebus includes a rear-mounted, four position tactical button switch that activates the flashlight in full brightness, low brightness (25%), and a strobing mode for emergency signaling and defense. Phoebus Lunetta 2.2 Light features a switch that steps through the modes sequentially or, if held down, activates the strobe mode first. Phoebus Lunetta Tactical Light has a run time, in full brightness mode, of 3 hours.